diff options
| author |   Johannes Weiner <hannes@cmpxchg.org> | 2013-02-22 16:35:20 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2013-02-23 17:50:20 -0800 |
| commit | 4805b02e90187c68d8f4e3305c3482b797e35809 (patch) | |
| tree | 65d574e7ee8068597f59b712417b6ecf700d1a49 /mm/mincore.c | |
| parent | mm: refactor inactive_file_is_low() to use get_lru_size() (diff) | |
| download | linux-dev-4805b02e90187c68d8f4e3305c3482b797e35809.tar.xz linux-dev-4805b02e90187c68d8f4e3305c3482b797e35809.zip | |
mm/mlock.c: document scary-looking stack expansion mlock chain
The fact that mlock calls get_user_pages, and get_user_pages might call
mlock when expanding a stack looks like a potential recursion.
However, mlock makes sure the requested range is already contained
within a vma, so no stack expansion will actually happen from mlock.
Should this ever change: the stack expansion mlocks only the newly
expanded range and so will not result in recursive expansion.
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Reported-by: Al Viro <viro@ZenIV.linux.org.uk>
Cc: Hugh Dickins <hughd@google.com>
Acked-by: Michel Lespinasse <walken@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/mincore.c')
0 files changed, 0 insertions, 0 deletions